#include<iostream>
using namespace std;
int exam5_19()
{
	char a[26];
	int i;
	a[1] = 'a';
	for (i = 0; i < 26; i++)
	{
		a[i] = a[i - 1] + 1;
		cout << a[i] << endl;
	}
	return 0;
}